题目：

题解：

int cmp(const void *a, const void *b) {return *(int*)a < *(int*)b;
}int thirdMax(int* nums, int numsSize){qsort(nums, numsSize, sizeof(nums[0]), cmp);int diff = 0;for (int i = 1; i < numsSize; i++) {if (nums[i] != nums[i - 1] && ++diff == 2) {return nums[i];}}return nums[0];
}